php中json_decode返回数组或对象

php中json_decode返回数组或对象

1.json_decode()

json_decode

(PHP 5 >= 5.2.0, PECL json >= 1.2.0)

json_decode — 对 JSON 格式的字符串进行编码

说明

mixed json_decode ( string $json [, bool $assoc ] )

接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

参数

json

待解码的 json string 格式的字符串。

assoc

当该参数为 TRUE 时,将返回 array 而非 object 。

返回值

Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.

范例

Example #1 json_decode() 的例子

代码如下

<?php

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

var_dump(json_decode($json));

var_dump(json_decode($json, true));

?>

上例将输出:

object(stdClass)#1 (5) {

["a"] => int(1)

["b"] => int(2)

["c"] => int(3)

["d"] => int(4)

["e"] => int(5)

}

array(5) {

["a"] => int(1)

["b"] => int(2)

["c"] => int(3)

["d"] => int(4)

["e"] => int(5)

}

$data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]';

echo json_decode($data);

结果为:

Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

可以看出经过json_decode()编译出来的是对象,现在输出json_decode($data,true)试下

代码如下

echo json_decode($data,true);

结果:

Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

可以看出 json_decode($data,true)输出的一个关联数组,由此可知json_decode($data)输出的是对象,而json_decode("$arr",true)是把它强制生成PHP关联数组.

假如我们获取的JSON数据如下:(可以使用curl、fsockopen等方式获取)

代码如下

{

"from":"zh",

"to":"en",

"trans_result":[

{

"src":"u4f60u597d",

"dst":"Hello"

}

]

}

一、json_decode返回array的方式:

json_decode($data,true);用json_decode函数返回array的方式得到:

代码如下

Array

(

[from] => zh

[to] => en

[trans_result] => Array

(

[0] => Array

(

[src] => 你好

[dst] => Hello

)

)

)

我们在PHP语言中可以用以下方法取得我们想要的值:

代码如下

<?php

$data = <<<STR

{

"from":"zh",

"to":"en",

"trans_result":[

{

"src":"u4f60u597d",

"dst":"Hello"

}

]

}

STR;

$jsondata=json_decode($data,true);

header("Content-Type: text/html; charset=UTF-8");

print_r($jsondata);www.111cn.net

echo "<br />".$jsondata['to']; //en

echo "<br />".$jsondata['trans_result'][0]['dst']; //Hello

?>

二、json_decode返回object的方式:

json_decode($data);

用json_decode函数返回object的方式得到:

代码如下

stdClass Object

(

[from] => zh

[to] => en

[trans_result] => Array

(

[0] => stdClass Object

(

[src] => 你好

[dst] => Hello

)

)

)

我们在PHP语言中可以用以下方法取得我们想要的值:

代码如下

<?php

$data = <<<STR

{

"from":"zh",

"to":"en",

"trans_result":[

{

"src":"u4f60u597d",

"dst":"Hello"

}

]

}

STR;

$jsondata=json_decode($data);

header("Content-Type: text/html; charset=UTF-8");

print_r($jsondata);

echo "<br />".$jsondata->from; //zh

echo "<br />".$jsondata->trans_result[0]->src; //你好

?>